style(markdown): fix typo in package name

1 files changed, 150 insertions, 0 deletions

diff --git a/markdown/ast_modifier.go b/markdown/ast_modifier.go
new file mode 100644
index 0000000..205786a
--- /dev/null
+++ b/markdown/ast_modifier.go
@@ -0,0 +1,150 @@
+package markdown
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"html/template"
+)
+
+var (
+	ErrInvalidUsage          = errors.Join(ErrInvalidParagraph, errors.New("invalid modifier usage"))
+	ErrInvalidTypeInModifier = errors.Join(ErrInvalidParagraph, errors.New("invalid type in modifier"))
+)
+
+type modifierTag string
+
+const (
+	boldTag modifierTag = "b"
+	emTag   modifierTag = "em"
+)
+
+type astModifier struct {
+	symbols string
+	tag     modifierTag
+	content []block
+	super   bool
+}
+
+func (a *astModifier) Eval() (template.HTML, *ParseError) {
+	var content template.HTML
+	for _, c := range a.content {
+		ct, err := c.Eval()
+		if err != nil {
+			return "", &ParseError{lxs: lexers{}, internal: err}
+		}
+		content += ct
+	}
+	if a.super {
+		return content, nil
+	}
+	return template.HTML(fmt.Sprintf("<%s>%s</%s>", a.tag, content, a.tag)), nil
+}
+
+func (a *astModifier) String() string {
+	content := "["
+	for _, c := range a.content {
+		content += "\n\t"
+		if v, ok := c.(fmt.Stringer); ok {
+			content += v.String()
+		} else {
+			b, _ := json.MarshalIndent(a.content, "\t", "  ")
+			content += string(b)
+		}
+		content += ",\n\t"
+	}
+	content += "]"
+	return fmt.Sprintf("modifier{sym: %s, tag: %s, super: %v, content: %s\n}", a.symbols, a.tag, a.super, content)
+}
+
+func modifier(lxs *lexers) (*astModifier, error) {
+	current := lxs.Current().Value
+	mod, err := modifierDetect(current)
+	if err != nil {
+		return nil, err
+	}
+	var s string
+	for lxs.Next() {
+		switch lxs.Current().Type {
+		case lexerLiteral, lexerHeader, lexerList:
+			s += lxs.Current().Value
+		case lexerModifier:
+			if mod.super && []rune(mod.symbols)[0] == []rune(lxs.Current().Value)[0] &&
+				len(mod.symbols) >= len(lxs.Current().Value) {
+				mod.symbols = mod.symbols[len(lxs.Current().Value):]
+				subMod, err := modifierDetect(lxs.Current().Value)
+				if err != nil {
+					return nil, err
+				}
+				if !subMod.super {
+					subMod.content = append(subMod.content, astLiteral(s))
+					mod, err = modifierDetect(mod.symbols) // this trick is so cool :D
+					if err != nil {
+						return nil, err
+					}
+				} else {
+					subMod, _ = modifierDetect("**")
+					subEm, _ := modifierDetect("*")
+					subEm.content = append(subEm.content, astLiteral(s))
+					subMod.content = append(subMod.content, subEm)
+				}
+				s = ""
+				mod.content = append(mod.content, subMod)
+				if len(mod.symbols) == 0 {
+					return mod, nil
+				}
+			} else {
+				if lxs.Current().Value == mod.symbols {
+					mod.content = append(mod.content, astLiteral(s))
+					return mod, nil
+				} else if len(s) != 0 {
+					mod.content = append(mod.content, astLiteral(s))
+					s = ""
+				}
+				c, err := modifier(lxs)
+				if err != nil {
+					return nil, err
+				}
+				mod.content = append(mod.content, c)
+			}
+		case lexerBreak:
+			lxs.Before() // because we did not use it
+			if len(s) != 0 {
+				return nil, ErrInvalidUsage
+			}
+			return mod, nil
+		case lexerExternal:
+			if lxs.Current().Value == "!" {
+				s += lxs.Current().Value
+			} else {
+				ext, err := external(lxs)
+				if err != nil {
+					return nil, err
+				}
+				mod.content = append(mod.content, ext)
+			}
+		default:
+			return nil, ErrInvalidTypeInModifier
+		}
+	}
+	if len(s) != 0 {
+		return nil, ErrInvalidUsage
+	}
+	return mod, nil
+}
+
+func modifierDetect(val string) (*astModifier, error) {
+	mod := new(astModifier)
+	mod.symbols = val
+	switch len(val) {
+	case 1:
+		mod.tag = emTag
+	case 2:
+		mod.tag = boldTag
+	case 3:
+		mod.super = true
+	default:
+		return nil, ErrInvalidUsage
+	}
+	return mod, nil
+}